It's worth noting that pH determines how much of any ammonia that's dissolved in the water column will be ionized as ammonium hydroxide. So if you have a high pH, you need to pay particular attention to ammonia.
But that doesn't change Diana's main point regarding pH/GH/KH, with which I agree completely.
But that doesn't change Diana's main point regarding pH/GH/KH, with which I agree completely.